Disc brake for a motor vehicle and arrangement of at least one pad retaining spring and a cover on a brake pad

Abstract

In an arrangement of at least one pad retaining spring (5) and a cover (6) on a brake pad (4) for a disc brake (1) of a motor vehicle, in particular a commercial vehicle, the brake pad (4) has a pad carrier plate (41) with at least one friction lining (42) attached thereto, wherein the pad retaining spring (5) is held radially deflectable on an outer edge (43) of the pad carrier plate (41, 141) v relative to an axis of rotation of a brake disc (2) of the disc brake (1), wherein the cover (6) is fixed in a receptacle (44) on the outer edge (43) of the pad carrier plate (41), wherein the cover (6) is held radially deflectable relative to the pad carrier plate (41) in the receptacle (44) of the pad carrier plate (41) by the spring force of the pad retaining spring (5) against an inner edge of the receptacle (44) furthest from the friction lining (42), and the The pad retaining spring (5) is freely movable in a radial direction within the hood (6),wherein a distance (a) of an underside (61) of the hood (6) to a support surface (46) of the receptacle (44) of the pad carrier plate (41) near the friction lining (42) is smaller than the distance (b) of the pad retaining spring (5) to the radially outer edge of the pad carrier plate (41) in the area of ​​the receptacle (44).

Description

[0001] The present invention relates to an arrangement of at least one pad retaining spring and a cover on a brake pad for a disc brake according to the preamble of claim 1.

[0002] In generic disc brakes, in particular pneumatic disc brakes in vehicles, especially commercial vehicles, brake pads are held in so-called pad shafts of a pad carrier by a pad retaining bracket spanning a recess of a brake calliper and pressed against a bridge of the pad shaft by pad retaining springs.

[0003] The pad retaining springs used for this purpose are designed in such a way that their construction is geared towards maximum resistance to vibration loads, such as those that occur on poor road surfaces.

[0004] This requires the pad retaining springs to be designed with relatively high spring forces. When the brake pads are installed, this results in a relatively high preload on the brake pads, which in turn requires a relatively high displacement force to move the brake caliper, for example, when releasing the brake.

[0005] This usually results in increased residual grinding torques between the brake pads and the brake disc, which leads to increased wear on the brake disc and the brake pads during vehicle operation.

[0006] Another disadvantage is a measurably higher fuel consumption.

[0007] The object of the present invention is to further develop an arrangement of at least one pad retaining spring and a hood on a brake pad of the generic type in such a way that, with a sufficiently high preload of the brake pads by the pad retaining springs, a sufficient service life of the pad springs under vibration load is possible and, furthermore, the preload of the brake pads is reduced compared to the generic disc brakes.

[0008] This object is achieved by an arrangement having the features of claim 1.

[0009] In the inventive arrangement of at least one pad retaining spring and a cover on a brake pad, the brake pad has a pad carrier plate with at least one friction pad attached thereto. The at least one pad retaining spring is arranged on an outer upper edge of the pad carrier plate.

[0010] The hood is also attached to the outer edge of the pad carrier plate, with which the pad retaining spring is secured against loss and held radially deflectable.

[0011] The pad retaining spring can, for example, be designed as an arc-shaped leaf spring.

[0012] The hood is held in a holder of the lining carrier plate so that it can be deflected radially relative to the lining carrier plate and is pressed by the spring force of the lining retaining spring against an inner edge of the holder remote from the friction lining.

[0013] The pad retaining spring can move freely in the radial direction within the hood.

[0014] In this case, a distance between an underside of the hood and a support surface of the support of the lining carrier plate near the friction lining is smaller than the distance of the lining retaining spring to the radially outer edge of the lining carrier plate in the area of ​​the support.

[0015] With such a hood, the hood itself acts as a stop against the pad carrier plate, thus preventing the pad retaining spring from becoming trapped between the pad carrier plate and the pad retaining bracket. In other words, the hood, as a separate, additional component of the disc brake, acts like a spacer, preventing the brake pad from striking the pad retaining spring.

[0016] This allows the spring preload of the pad retaining spring and the radial stroke limitation of the brake pad to be adjusted independently of each other, which allows the characteristic curve of the pad retaining spring to be better utilized.

[0017] A major advantage over previous solutions, in which the comparatively hard lining carrier plate strikes the lining retaining spring attached to it under strong vibration loads, is that the hood, which is more elastic than the lining carrier plate, offers better damping properties under vibration loads, thereby reducing noise and the load on the lining retaining bracket.

[0018] The hood design described above makes it possible, in particular, to design the pad retaining spring with a lower spring force, since extreme vibration loads do not have to be completely compensated for by the pad retaining spring alone; instead, the hood serves as a supporting stop. The hood is thus exposed to the strong vibration loads instead of the pad retaining spring.

[0019] This makes it possible to use pad retaining springs with lower and more precisely adjustable spring forces, with the advantage that increased residual grinding torques between the brake pads and the brake disc and thus fuel consumption can be significantly reduced.

[0020] Preferably, the elasticity of the hood in the radial direction is smaller than the elasticity of the pad retaining spring and greater than the elasticity of the pad carrier plate and thus serves itself as a spring element with a greater spring constant than the pad retaining spring, so that hard impacts are cushioned by the hood itself and thereby protects and relieves the pad retaining spring.

[0021] According to an advantageous embodiment of the arrangement according to the invention, the receptacle is designed as a circumferentially closed through-opening, whereby the hood is reliably held on the lining carrier plate.

[0022] Alternatively, the receptacle is designed as a through-opening with a gap between two projections facing each other, the width of which is designed such that the hood is not removable, whereby the hood is reliably held to the lining carrier plate.

[0023] In the area of ​​the hood mount, the pad backing plate is tapered in the axial direction to ensure sufficient clearance to adjacent brake components.

[0024] A simple production of such a hood is preferably ensured by bending the hood from a single piece of sheet metal.

[0025] Preferably, adjacent edges of the hood are connected to one another in a material-to-material manner, in particular welded.

[0026] The hood preferably has an approximately rectangular cross-section, which on the one hand ensures a sufficiently large contact surface on the pad retaining bracket and the pad carrier plate and on the other hand ensures sufficient stability of the hood.

[0027] According to a further embodiment, the hood is wider in the upper area, i.e. area close to a pad retaining bracket, than in the lower area, close to the edge of the pad carrier plate, in order to maintain sufficient space in the lower area relative to adjacent components, while sufficient space is ensured in the upper area for a sufficient width of the pad retaining spring.

[0028] The distance between an underside of the hood and a support surface of the pad carrier plate holder, against which an underside of the hood can be pressed in the event of a radial deflection of the brake pad in the direction of the pad retaining bracket, is preferably smaller than the distance between the pad retaining spring and the radially outer edge of the pad carrier plate in the area of ​​the holder.

[0029] According to a further embodiment of the invention, a central part of the pad retaining spring has a slot through which a side wall of the hood is guided.

[0030] This ensures a simple connection between the pad retaining spring and the hood.

[0031] In the following, exemplary embodiments of the invention are explained in more detail with reference to the accompanying drawings. They show: Figure 1 is a sectional view through an embodiment of a disc brake according to the invention, Figure 2 is an isometric detailed view of a rear brake pad held by a pad retaining bracket in a pad shaft of the disc brake and a hood held thereon, radially securing the pad retaining spring, Figure 3 is a plan view of the Fig. 2 illustrated arrangement of brake pad, pad retaining spring and pad retaining bracket, Figure 4 a further isometric representation of the brake pad arranged in the pad shaft, Figure 5 a front view of an alternative design variant of a brake pad of a disc brake with pad retaining spring arranged thereon and alternatively designed hood held on the brake pad, Figure 6 an isometric representation of the in Fig. 5 illustrated arrangement with flattened bolt, Figure 7 a side sectional view of a brake pad arranged in a pad shaft according to Figure 5, Figure 8 a front view of an alternative design variant of a brake pad with pad retaining springs secured by a hood held on it, Figure 9 an isometric detailed view of the Fig. 8 shown variant, Figure 10 another isometric representation corresponding Fig. 9 from the front side of the brake pad, Figure 11 a side sectional view of the Figures 8 - 10 shown variant and Figure 12 an isometric individual representation of a design variant of a hood.

[0032] In the following description of the figures, terms such as top, bottom, left, right, front, rear, etc., refer exclusively to the exemplary representation and position of the brake pad, the brake lining, the pad retaining spring, the cover, and the like chosen in the respective figures. These terms are not to be understood as limiting; i.e., these references may change due to different operating positions or the mirror-symmetrical design, etc.

[0033] In a Cartesian coordinate system, the Y-axis is parallel to the brake disc rotation axis, the Z-axis is perpendicular to the brake disc rotation axis (see Fig. 2) through the brake disc's rotational axis radially in the direction of the pad retaining bracket or parallel to this line, and the X-axis runs perpendicular to the Y-axis and the Z-axis. The radial direction is understood to be a direction radial to the brake disc's rotational axis. When using the term "radial" in reference to the brake pad, the radial direction corresponds to the direction of the Z-axis.

[0034] In Fig. 1 Reference numeral 1 denotes a variant of a disc brake. The disc brake 1 comprises a brake disc 2 and a brake caliper 3 spanning the brake disc 2, which is designed here as a sliding caliper with an application section 31 and a back section 32.

[0035] In the application section 31 of the brake calliper 3, a brake lever 17 which can be actuated by a brake cylinder is accommodated, which actuates a brake piston 16 which, when the brake is applied, presses against a brake pad 4 on the application side.

[0036] The brake pads 4 can be inserted into or removed from a pad shaft 13 through a recess 14 in a bridge section between the application section 31 and the back section 32 of the brake calliper 3.

[0037] In the embodiment shown here, the lining shaft 13 is part of a brake carrier 11 and is formed by brake carrier horns 12 arranged at a distance from one another in the circumferential direction of the brake disc 2 and a bridge 15 connecting the brake carrier horns 12 to one another.

[0038] The disc brake 1 has, in addition to the brake pad 4 on the application side, a rear brake pad 4. Each of the brake pads 4 has a pad carrier plate 41, which is held in the pad shaft 13 by a pad retaining spring 5 arranged on the pad carrier plate 41 against a pad retaining bracket 7 releasably attached to the brake caliper 3. Furthermore, a friction pad 42 is attached to the pad carrier plate 41, which is pressed against the friction surfaces of the brake disc 2 when the brake is applied.

[0039] It is also conceivable to spring the brake pad 4 with two or more pad retaining springs in order, for example, to generate a progressive spring characteristic curve.

[0040] At the Fig. 1In the embodiment of the disc brake 1 shown, the pad retaining bracket 7 is secured in the region of the back section 32 by a bolt 8 aligned perpendicular to the longitudinal extent of the pad retaining bracket 7. The bolt 8 is secured against falling out by a split pin 9 in a bore in the back section 32 of the brake caliper 3.

[0041] As in the Fig. 1 - 4 As shown, the pad retaining springs 5 ​​are designed as arcuate leaf springs. The pad retaining springs 5 ​​are held radially deflectable on an outer edge 43 of the pad carrier plate 41, which is radially aligned with the rotational axis of the brake disc 2.

[0042] A hood 6 covering the pad retaining spring 5 towards the pad retaining bracket 7 is, as shown in the Fig. 2 to 4 shown, mounted and held on the lining carrier plate 41 in the region of a receptacle 44 of the lining carrier plate 41 so as to be radially deflectable relative to the lining carrier plate 41.

[0043] The hood 6 forms an arrangement according to the invention together with at least one pad retaining spring 5 and a brake pad 4.

[0044] The hood 6 is preferably designed in the form of a clamp and can thus be spread open for installation in the holder 44 of the lining carrier plate 41.

[0045] Due to the spring force of the pad retaining spring 5, which is supported in the area of ​​outer pieces 51 on lugs 45 projecting radially outwards from the radially outer edge 43, the hood 6 is pressed against an underside 71 of the pad retaining bracket 7 facing the brake pad 4, so that when the motor vehicle is traveling, for example on uneven roads, a movement of the brake pads 4 radially upwards, ie viewed from the axis of rotation of the brake disc 2 in the direction of the pad retaining bracket 7, is largely suppressed by the spring force of the pad retaining springs 5.

[0046] Stronger forces acting radially upwards on the brake pads 4 are prevented by the hood 6.

[0047] For this purpose, the pad retaining spring 5 is freely movable in the radial direction within the hood 6, wherein the radial deflectability of the brake pad 4 is limited by the pad carrier plate 41 striking the hood 6 which is pressed by the pad retaining spring 5 onto the underside 71 of the pad retaining bracket 7 facing the brake pad 4.

[0048] As in Fig. 3 As shown, the distance a of an underside 61 of the hood 6 to a support surface 46 of the receptacle 44 of the lining carrier plate 41, against which the underside 61 of the hood 6 can be pressed in the event of a radial deflection of the brake pad 4 in the direction of the pad retaining bracket 7, is smaller than the distance b of the pad retaining spring 5 to the radially outer edge of the lining carrier plate 41 in the region of the receptacle 44.

[0049] In the event of a radial deflection of the brake pad 4 in the direction of the pad retaining bracket 7, an underside 61 of the hood 6 is pressed against this support surface 46 of the holder 44.

[0050] In the embodiment shown, the pad retaining springs 5 ​​are held captively on the pad carrier plate 41 by means of the hood 6.

[0051] For this purpose, the pad retaining spring 5 is formed with a slot 54 in the central region 53 of the pad retaining spring 5, through which, in the exemplary embodiment shown, the side wall 63 of the hood 6 near the friction lining 42 is passed, so that the pad retaining spring 5 is held on the hood 6 so as to be movable in the radial direction, but cannot be released from it when the hood 6 is fixed to the pad carrier plate 41.

[0052] The receptacle 44 of the lining carrier plate 41 is preferably designed as a circumferentially closed through-opening. The receptacle 44 is, as shown in the Fig. 2-4shown, is preferably slot-shaped and is delimited towards the pad retaining bracket 7 by a web 47. A bottom 61 of the hood 6 forming a base 61 is received in the slot.

[0053] The upper side of this web 47 facing the pad retaining bracket 7 forms the radially outer edge 43, which is not pressed against the pad retaining spring 5 even when a greater force is applied to the brake pad 4 in the radial direction due to the height h of the hood 6.

[0054] Alternatively, the receptacle 44 is limited to the pad retaining bracket 7 by two projections directed towards each other, as will also be explained below with reference to Figure 6 described in more detail alternative variant is shown, wherein a gap between the projections is smaller than the width of the hood 6 in the direction of the longitudinal extension of the pad retaining spring 5.

[0055] The hood 6 is preferably bent from a single piece of sheet metal, preferably into a hood 6 with an approximately rectangular cross-section with the underside 61 facing the support surface 46 of the lining carrier plate 41, an upper side 62 facing the lining retaining bracket 7 and two approximately radially extending side walls 63, wherein a free end of one of the side walls 63, 64 abuts the underside 61 of the hood 6.

[0056] Adjacent edges of the hood 6 are preferably connected to one another in a form-fitting or material-fitting manner, in particular welded to one another.

[0057] As particularly in Fig. 3As shown, in one embodiment, the hood 6 is wider in an upper region near the pad retaining bracket 7 when installed than in a lower region near the edge 43 of the pad carrier plate 41. This creates sufficient space in the lower region relative to adjacent components, while ensuring sufficient space in the upper region for a sufficient width of the pad retaining spring.

[0058] According to a variant not shown here, the hood 6 has a constant width and thus parallel side walls.

[0059] It is also conceivable to design the hood 6 with convex-shaped side walls, which counteract jamming of the hood 6 on the lining carrier plate 41 under high load.

[0060] It is also conceivable to design the pad retaining spring 5 without the slot 54 described above and to accommodate it completely within the tunnel formed by the side walls 63, 64 and the top side 62 and bottom side 61 of the hood 6.

[0061] It is also conceivable that the hood 6 serves to accommodate two pad retaining springs 5 ​​in order to be able to represent a progressive spring characteristic curve.

[0062] In the Fig. 5-12 In the embodiments of the disc brake 1 shown, the bolt 8, which serves to secure the pad retaining bracket 7 on the back section 32 of the brake calliper 3, serves in principle as a radial stop against a stop surface of the pad carrier plate 141.

[0063] As particularly in Fig. 9 As shown, the bolt fastened in the back section 32 of the brake calliper 3 protrudes from the back section 32 (not shown here) through a through opening 165 of the hood 106 into an interior of the hood 106.

[0064] The receptacle 144 of the lining carrier plate 141 is delimited radially inwardly by two projections 147 directed toward one another in the direction of the longitudinal extension of the lining retaining spring 5. The projections 147 are enclosed by radially extending side walls 163 and a web formed on one of the side walls 163 and forming the underside 161 of the hood 106. Adjacent edges of the hood 6 are preferably connected to one another by a material bond, in particular by welding.

[0065] The side walls 163 are aligned parallel to the friction lining surface of the friction lining 142.

[0066] The webs forming the underside 161 of the hood 106 engage under the projections 147 in the assembled state and thus ensure the radial fixation of the hood 106 within the receptacle 144.

[0067] The support surface 146 is slightly raised compared to the adjacent areas of the edge, forming a plateau, so that in the event of the support surface 146 formed as a plateau striking the bearing surface 83 of the bolt 8, it is not obstructed by the underside 161 of the hood 106.

[0068] Preferably, the plateau-like support surface 146 is raised to such an extent that when the support surface 83 of the bolt 8 strikes, the underside 161 of the hood 106 simultaneously comes to rest on the edge 143 of the lining carrier plate 141.

[0069] As in Fig. 7 As shown, the bolt 8 is preferably aligned parallel to the axis of rotation of the brake disc 2.

[0070] As in the Figures 5-11As further shown, a region of the bolt 8 positioned within the hood 106 in the assembled state is formed with a flattened support surface 83 facing the stop surface 146 of the lining carrier plate 141, whereby the surface pressure is reduced in the event of an impact.

[0071] Even in the Fig. 5-12 In the embodiments shown, the hood 106 extends radially over the pad retaining spring 5. The pad retaining spring 5 is formed with a slot 54 in the central region 53 of the pad retaining spring 5, through which, in the embodiment shown, the side wall 163 of the hood 106 near the friction lining 142 is passed.

[0072] Particularly in this embodiment, it is also conceivable to design the hood 6 with the pad retaining spring 5 mounted thereon as a pre-assembled unit.

[0073] While in the Fig. 5-7In the embodiment shown, the bolt 8 is secured against axial displacement by a split pin in an area between the back section 32 of the brake calliper 3 and the hood 106, in the embodiment shown in the Fig. 9-12 In the embodiments shown, the hood 106 is designed with two securing webs 167 protruding from the side walls 163 of the hood 106 for axially fixing the bolt 8 (axially to the longitudinal axis of the bolt 8).

[0074] The bolt 8 has corresponding grooves 84 in its outer surface 82, into which the securing webs 167 protrude in the assembled state and thus ensure the axial fixation of the bolt 8.

[0075] In principle, it is also conceivable to form only one groove 84 and accordingly only one such securing web 167 on the hood 106.

[0076] The hood 106 is in Fig. 12 shown in an isometric single view.

[0077] The hood 106 is also preferably bent from a piece of sheet metal into a cuboid shape, wherein the side wall 164 with the through opening 165 is formed by two web-like side wall surfaces from which the through opening 165 is cut out.

[0078] The front side wall 163 also has two such webs, which are bent in the end region toward the underside 161. The securing webs 167 are molded onto the side wall 163.

[0079] For assembly, the hood 106 can first be inserted into the receptacle 144 in a tilting movement and then moved radially downwards so that the securing webs 167 engage in the grooves 84 of the bolt 8.

[0080] If the hood 106 is already pre-assembled, it is also possible to design the securing webs 167 as spring elements for mounting and securing the bolt 8 in such a way that they are spread open when the bolt 8 is inserted into the hood 8 and then engage in the grooves 84 of the bolt 8.

[0081] It is also conceivable to form, instead of the support surface 146 on the lining carrier plate 141 within the hood 106, a stop web provided parallel to the underside 161 approximately above the underside 161, on which the support surface 83 of the bolt 8 strikes in the event of a lifting of the brake pad 104 caused by strong vibration.

[0082] It is also conceivable to design the rear through-opening 165 of the hood 106 as a circular or elliptical opening.

[0083] The description also concerns several items. 1. Subject: Disc brake for a motor vehicle, in particular for a commercial vehicle, comprising a brake disc, a brake caliper, in particular a sliding caliper, with an application section and a back section, at least two brake pads, each with a pad carrier plate provided with at least one pad retaining spring, which are held in a pad shaft under pretension by the respective pad retaining spring against a pad retaining bracket detachably attached to the brake caliper, wherein the pad retaining spring is held radially deflectable on an outer edge of the pad carrier plate radially relative to a rotational axis of the brake disc, wherein a hood is held in a receptacle of the pad carrier plate and can be pressed by the spring force of the pad retaining spring against an underside of the pad retaining bracket facing the brake pad, wherein the pad retaining spring is freely movable in the radial direction within the hood,wherein the radial deflection of the brake pad is limited by the cap striking the pad carrier plate. 2. Subject: Disc brake according to subject 1, wherein the receptacle is designed as a circumferentially closed through-opening. 3. Subject: Disc brake according to subject 1, wherein the receptacle is limited towards the pad retaining bracket by two projections directed towards one another, wherein a gap between the projections is smaller than the width of the cap in the direction of the longitudinal extension of the pad retaining spring. 4. Subject: Disc brake according to one of the preceding subjects, wherein the cap is bent from a single piece of sheet metal. 5. Subject: Disc brake according to subject 4, wherein adjacent edges of the cap are integrally connected to one another, in particular welded to one another. 6. Subject: Disc brake according to one of the preceding subjects,wherein the cover has an approximately rectangular cross-section. 7. Subject: Disc brake according to one of the preceding subjects, wherein in the radial direction the elasticity of the cover is less than the elasticity of the pad retaining spring and greater than the elasticity of the pad carrier plate. 8. Subject: Disc brake according to one of the preceding subjects, wherein the cover is wider in an upper region near the pad retaining bracket in the installed state than in a lower region near the edge of the pad carrier plate. 9. Subject: Disc brake according to one of the preceding subjects, wherein a distance between an underside of the cover and a support surface of the pad carrier plate holder, against which the underside of the cover can be pressed in the event of a radial deflection of the brake pad in the direction of the pad retaining bracket,is smaller than the distance between the pad retaining spring and the radially outer edge of the pad carrier plate in the region of the receptacle. 10. Subject: Disc brake for a motor vehicle, in particular for a commercial vehicle, comprising a brake disc, a brake caliper, in particular a sliding caliper, with an application section and a back section, at least two brake pads, each with a pad carrier plate provided with at least one pad retaining spring, which are held in a pad shaft under pretension by the respective pad retaining spring against a pad retaining bracket releasably attached to the brake caliper, wherein the pad retaining spring is held radially deflectably on an outer edge of the pad carrier plate radially relative to a rotational axis of the brake disc, wherein a hood is held in a receptacle of the pad carrier plate and can be pressed by the spring force of the pad retaining spring against an underside of the pad retaining bracket facing the brake pad,wherein the pad retaining bracket is secured by a bolt fastened to the back section of the brake caliper in a displacement-proof manner, wherein the bolt is designed to protrude from the back section through a through-opening in the hood into an interior of the hood as a radial stop relative to a stop surface of the pad carrier plate. 11. Subject: Disc brake according to subject 10, wherein the bolt is aligned parallel to the axis of rotation of the brake disc. 12. Subject: Disc brake according to subject 10 or 11, wherein a region of the bolt positioned within the hood in the assembled state has a lateral surface with a flattened support surface facing the stop surface of the pad carrier plate. 13. Subject: Disc brake according to one of subject 10 to 12, wherein the receptacle for the pad retaining bracket is delimited by two projections directed towards one another, which are formed by radially extending side walls and aare enclosed by webs forming the underside of the hood. 14. Subject: Disc brake according to one of the subjects 10 to 13, wherein a region of the bolt positioned within the hood in the assembled state has a lateral surface with at least one groove into which a securing web protrudes from one of the side walls of the hood for axially fixing the bolt. 15. Subject: Disc brake according to one of the preceding subjects, wherein a center piece of the pad retaining spring has a slot through which a side wall of the hood is guided. List of reference symbols

[0084] 1 disc brake 2Brake disc 3Brake caliper 31Clamping section 32Back section 4Brake pad 41Pad carrier plate 42Friction pad 43Edge 44Receptacle 45Nose 46Support surface 47Web 48Edge 104Brake pad 141Pad carrier plate 142Friction pad 143Edge 144Receptacle 145Nose 146Support surface 5Pad retaining spring 51Outer piece 52Intermediate piece 53Middle piece 54Slot 6Hood 61Bottom 62Top 63Side wall 64Side wall 106Cover 161Bottom 162Top 163Side wall 164Side wall 165Through opening 166Support bar 167Securing bar 7Base retaining bracket 8Bolt 81Bolt head 82Surface 83Support surface 84Groove 9Splint 11Brake carrier 12Brake carrier horn 13Pad shaft 14Recess 15Bridge 16Brake piston 17Brake lever dThickness of the pad retaining spring aDistance bDistance xDirection yDirection zDirection

Claims

1. Arrangement of at least one pad retaining spring (5) and a cover (6) on a brake pad (4) for a disc brake (1) of a motor vehicle, in particular a commercial vehicle, - wherein the brake pad (4) has a pad carrier plate (41) with at least one friction pad (42) fastened thereto, - wherein the pad retaining spring (5) is held radially deflectable on an outer edge (43) of the pad carrier plate (41, 141) radially relative to a rotational axis of a brake disc (2) of the disc brake (1), - wherein the cover (6) is fixed in a receptacle (44) on the outer edge (43) of the pad carrier plate (41), characterized in that- the hood (6) is held radially deflectable relative to the lining carrier plate (41) in the receptacle (44) of the lining carrier plate (41) and is pressed by the spring force of the lining retaining spring (5) against an inner edge of the receptacle (44) remote from the friction lining (42), and - the lining retaining spring (5) is freely movable in the radial direction within the hood (6), - wherein a distance (a) of an underside (61) of the hood (6) to a support surface (46) of the receptacle (44) of the lining carrier plate (41) close to the friction lining (42) is smaller than the distance (b) of the lining retaining spring (5) to the radially outer edge of the lining carrier plate (41) in the region of the receptacle (44).

2. Arrangement (4) according to claim 1, characterized in that the receptacle (44) is designed as a circumferentially closed through opening.

3. Arrangement (4) according to claim 1, characterized in thatthe receptacle (44) is delimited towards the pad retaining bracket (7) by two projections directed towards one another, wherein a gap between the projections is smaller than the width of the hood (6) in the direction of the longitudinal extension of the pad retaining spring (5).

4. Arrangement (4) according to one of the preceding claims, characterized in that the hood (6) is bent from a piece of sheet metal.

5. Arrangement (4) according to claim 4, characterized in that adjacent edges of the hood (6) are materially connected to one another, in particular welded to one another.

6. Arrangement (4) according to one of the preceding claims, characterized in that the hood (6) has an approximately rectangular cross-section.

7. Arrangement (4) according to one of the preceding claims, characterized in that Side walls of the hood (6) are convex.

8. Arrangement (4) according to one of the preceding claims, characterized in that the pad retaining spring (5) is designed as an arcuate leaf spring.

9. Arrangement (4) according to one of the preceding claims, characterized in that in the radial direction the elasticity of the hood (6) is less than the elasticity of the pad retaining spring (5) and greater than the elasticity of the pad carrier plate (41).

10. Arrangement (4) according to one of the preceding claims, characterized in that a central piece (53) of the pad retaining spring (5) has a slot (54) through which a side wall (63, 163) of the hood (6) is guided.

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